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Rotation interface in cfx for mesh deformation

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Old   March 31, 2014, 04:52
Default Rotation interface in cfx for mesh deformation
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Ion
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Hi,

As part of my engineering project, I study the flow in a screw compressor with Ansys CFX. First I try to study only 2.5 D to see how the Ansys CFX manage to do the mesh deformation but i have some problems.(you can see a picture in attachment with my cfx case)

If there's someone how study this type of machine please give me some advise.

Best regards.
Ion
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Old   March 31, 2014, 06:03
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Glenn Horrocks
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This will be extremely difficult to model with mesh motion. It is very easy with immersed solids - have a look at the CFX tutorial examples for an example of this exact simulation.

But if you insist on doing it using moving mesh then you are going to need automatic remeshing. But really you would have to be a masochist to do it this way when the immersed solids method is so much easier.
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Old   March 31, 2014, 11:22
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tim kirkland
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ghorrocks.. but immersed solids approach is not applicable to compressible flows. I am working on the same type of problem and use an external grid generation tool for each timestep.
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Old   March 31, 2014, 18:00
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OK. In that case you are forced to do it the hard way. But if the flow is incompressible the immersed solids approach is strongly recommended.

If the motion is simple rotation and not coupled to the fluid flow then you can generate a series of meshes at different rotation angles, then use a series of simulations on each mesh then transfer to the next mesh. This can be scripted to run automatically as a full run. This is reasonably easy to do. So this is not dynamic remeshing, rather using pre-generated meshes as the motion is known in advance.
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Old   April 3, 2014, 03:52
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Matthias Voß
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You can ask for advise here ... this looks pretty much like what you need.
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